10. Neurology
Ever since the first person hypnotized another person, people wondered how they could control the minds of people. Just glaze at that swinging watch for a while... The Third Doctor first use this to dehypnotize Bellal in Death to the Daleks and the Fourth Doctor did the same to Leela in The Face of Evil . The screwdriver's uses in Neurology came to the forefront in Invasion of the Bane when Mrs. Wormwood used her phonic ring to scatter people's brain patterns. The screwdriver was controlling people's brains. But how? Binaural Beats are auditory processing sounds, caused by specific physical stimuli, an effect discovered in 1839 by Heinrich Wilhelm Dove. Brainwave entrainment causes your brainwave frequencies to fall into step with a specific frequency. This is commonly used to help people fall asleep to soothing sounds. The human brain has a tendency to change its binaural beats to a dominant EEG frequency . This works using two tones close in frequency to generate a beat frequency which is the difference of the frequencies. These frequencies give some measure of control over a person's brainwaves.